Ventricular arrhythmias are associated with aging and are a leading cause of sudden cardiac death. A new study shows that hyperactivation of p38γ/δ MAPKs is a key driver of stress-induced ventricular arrhythmias via increased phosphorylation of ryanodine receptor 2 at Ser2367 and impaired localization of potassium voltage-gated channel Kv4.3.
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